<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script src="../js/vue.js"></script>
    <div id="app">
        {{msg}}
    </div>

    <script>
        var vm = new Vue({
            el: "#app",
            data: {
                msg: 'hello world'
            },
            beforeMount(){
                console.log("挂载之前")
                console.log(this.$el.innerHTML)//通过this.$el获取el的DOM元素
            },
            mounted(){
                console.log("挂载之后")
                console.log(this.$el.innerHTML)
            }
        })
    </script>

</body>

</html>